Name	Data Type	Definition
type	CodeHoldingUsageType	A code indicating the type of holding procedure. E.g. en-route holding, terminal area holding.
outboundCourse	ValBearingType	The radial, course, bearing or magnetic directional course (if navaid is a localizer) from the facility or waypoint on which holding is based.
outboundCourseType	CodeCourseType	The type of course to be observed. E.g. true track, magnetic track, heading, VOR radial, true bearing, magnetic bearing
inboundCourse	ValBearingType	The course of the inbound leg.
turnDirection	CodeDirectionTurnType	Direction of the turn
upperLimit	ValDistanceVerticalType	Max altitude allowed for all aircraft categories at all defined speeds
upperLimitReference	CodeVerticalReferenceType	A code indicating the reference for a vertical distance. Two series of values exist: 1) real distance: from GND, from the MSL, from the WGS-84 ellipsoid 2) pressure distance.
lowerLimit	ValDistanceVerticalType	Minimum altitude allowed for all aircraft categories at all defined speeds
lowerLimitReference	CodeVerticalReferenceType	A code indicating the reference for a vertical distance. Two series of values exist: 1) real distance: from GND, from the MSL, from the WGS-84 ellipsoid 2) pressure distance.
speedLimit	ValSpeedType	Restricted speed for containment in a smaller pattern
instruction	TextInstructionType	Operational instructions that must be observed when flying the HoldingPattern.
nonStandardHolding	CodeYesNoType	ndicates whether the HoldingPattern is non-standard, for example because it uses left-hand turns.

Association	Multiplicity	Role	To	Role description
hasSpan	0..1	outboundLegSpan	HoldingPatternLength	Outbound leg ends at a choice of a time, a length or a defined end point.
isBasedOn	0..1	holdingPoint	SegmentPoint	The point used to define the holding pattern.
isDepictedBy	0..1	extent	Curve	The geographical curve depicted as a race track pattern
hasAnnotations	0..*	annotation	Note

From	Association	Multiplicity	Role	To	Role description
HoldingAssessment	determines	0..1	assessedHoldingPattern	The HoldingPattern assessed by the HoldingAssessment.
InformationService	concerns	0..*	clientHolding	The holding pattern for which the information is provided.
AirTrafficControlService	controls	0..*	clientHolding	The Holding Pattern on which the air traffic control is provided.
SegmentLeg	establishes	0..1	holding	Established holding used on a procedure.

1 - Holding Pattern , 2 - Unplanned Holding , 3 - Segment Leg , 4 - Information Services , 5 - Air Traffic Control Services